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Single Family ResidenceResidential
$700,269$248 / ft²
TopHap EstimateOur estimate of what this home would sell for today, based on nearby sales, the home's size and features, and local price trends. It is a starting point, not an appraisal.· confidence 94How well the pricing models agreed with each other on this home. Higher means the estimate rests on stronger, more consistent data.· as of Jul 14, 2026
Last sold for $480,000 on Oct 15, 2010

309 FREDERICK AVE

ROCKVILLE, MD 20850
3.5
Baths
2,822 ft²
Living AreaTotal finished area of the structures, from county records. Some counties include shared space like hallways or a building gym, so it may not match a listing.
0.32 ac
Lot SizeThe size of the land the home sits on, from county records.
2008
Year BuiltThe year the home was originally built, according to county records.
2
StoriesHow many floors the home has above ground.
2
ParkingThe number of parking spaces on the property, including the garage.

Valuation

$700K
$661K low$740K high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$480,000 · Oct 15, 2010

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$8,703 (2025)
Assessed ValueThe value the county assigns to this home to calculate property tax. It is often lower than what the home would sell for.$697,800 (2026)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$214,100
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$483,700
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$645,000
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$697,800

Climate Risk

Overall riskThe average of the five hazard scores below, on a 0 to 100 scale. Higher means greater projected risk over the coming decades.9
1
FloodProjected flooding risk from rivers, heavy rain, and storm surge, scored 0 to 100. Higher is riskier.
16
WildfireProjected wildfire risk, scored 0 to 100, based on how much land burns in a typical year. Higher is riskier.
29
DroughtProjected water shortage risk, scored 0 to 100. Higher means more strain on the local water supply.
FEMA Flood ZoneFEMA's flood zone for this address. Zones starting with A or V are high risk, and lenders usually require flood insurance there.minimal

Scores 0–100; higher = greater projected risk.

Property Facts

Property TypeThe broad category the county puts this property in, such as residential or commercial.Single Family Residence
StyleThe architectural style of the home, such as ranch or colonial.Bi-Level
CountyMONTGOMERY
Lot (acres)The size of the land the home sits on, from county records.0.33
ConstructionThe main material the home's frame and walls are built from.Frame (Unspecified)
RoofThe main material covering the roof, such as asphalt shingle or tile.Composition Shingle
HeatingThe type of heating system in the home.Yes
CoolingThe type of cooling or air conditioning in the home.Central
FireplaceWhether the home has a fireplace, and what kind.Yes
GarageWhether the property has a garage, and details like whether it is attached to the home.Garage, Attached
PoolWhether the property has a pool, and what kind, such as in-ground.No
FeaturesExtra features found in county records. Records are not complete everywhere, so a missing feature does not always mean the home lacks it.Deck · 104 ft²Shed · 160 ft²

Transaction History(1)

Sales and refinances filed with the county for this home. Not every transfer is a normal sale, so check the type before comparing prices.

Assigned SchoolsThe public schools this address is zoned for. Boundaries change, so confirm with the district before you count on it.

E
Beall Elementary SchoolB
Elementary · Grades PK–5 · 1.0 mi
H
Richard Montgomery High SchoolA-
High · Grades 9–12 · 1.0 mi
M
Julius West Middle SchoolA
Middle · Grades 6–8 · 1.6 mi

District: Montgomery County Public Schools

Neighborhood · ZIP 20850These are comparison scores, not percentages. 100 equals the national average, so 150 means about 50% above average.

CrimeLocal crime compared with the rest of the country, where 100 is average. It reflects things like population density, income, and how crime gets reported.104
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.89
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.40

Index scale: 100 = US average (tick). Lower is better.

Homes occupiedThe share of homes here that someone lives in. The rest sit empty, including vacation and for-sale homes.95%
Bachelor's or higherThe share of adults 25 and older whose highest degree is a bachelor's degree.28%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.7.8%
UnemploymentThe share of men 16 and older who are out of work and actively looking. Only men are counted in this figure.0.8%
PopulationHow many people live in this area.51,693
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.3,703 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$126,425
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$154,183
Average tempThe average temperature here across a full year.54°F
Annual precipHow much rain and melted snow falls here in a typical year.43 in
SunshineThe share of daylight hours that get direct sun in a typical year, counting cloud cover.57%

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Data by ATTOM. Valuations are automated estimates, not appraisals. Photos from Google Street View and may not depict the current property state.

How this home compares

309 Frederick Ave measured against every home in its neighborhood, its ZIP code and its county, using county assessor records refreshed nightly. A home can stand out in one of those areas and look ordinary in another, because each one holds a different mix of homes.

  • Costs less per square foot than 93% of homes in Rockville
  • Bigger than 82% of homes in Rockville
  • Has a bigger lot than 94% of homes in Rockville
  • Newer than 93% of homes in Montgomery County

What homes are worth in Rockville 20850

Each bar is how many homes fall in that price range. The marker is this home.

This home
$177K$1.7M

This home is worth more than 43% of homes in Rockville 20850.

How it measures up in Rockville 20850

The dot is this home. The mark in the middle is the typical home in Rockville 20850.

Estimated value$700,269
CheaperTypical $770,079Pricier

Pricier than 43% of homes nearby

Price per ft²$248
CheaperTypical $340Pricier

Pricier than 10% of homes nearby

Living area2,822 ft²
SmallerTypical 2,037 ft²Bigger

Bigger than 74% of homes nearby

Lot size0.32 ac
SmallerTypical 4,225 ft²Bigger

Bigger than 88% of homes nearby

Year built2008
OlderTypical 1991Newer

Newer than 92% of homes nearby

How 309 Frederick Ave ranks against every home in each area.
MeasureThis homeRockvilleRockville 20850Montgomery County
Estimated valuepricier than$700,26954% of homes43% of homes57% of homes
Price per ft²pricier than$2487% of homes10% of homes23% of homes
Living areabigger than2,822 ft²82% of homes74% of homes74% of homes
Lot sizebigger than0.32 ac94% of homes88% of homes80% of homes
Year builtnewer than200892% of homes92% of homes93% of homes

About 309 Frederick Ave

How much is 309 Frederick Ave, Rockville, MD worth?

The TopHap Estimate for 309 Frederick Ave, Rockville, MD is $700,269 as of Jul 14, 2026. The likely range is $660,953 to $739,585. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 309 Frederick Ave, Rockville, MD last sell?

309 Frederick Ave, Rockville, MD last sold on Oct 15, 2010 for $480,000, according to the county's recorded deed.

How big is 309 Frederick Ave, Rockville, MD?

309 Frederick Ave, Rockville, MD has 3.5 bathrooms, 2,822 square feet of living space and a 0.33-acre lot.

When was 309 Frederick Ave, Rockville, MD built?

309 Frederick Ave, Rockville, MD was built in 2008, making it 18 years old. It is a bi-level home. The building has 2 stories.

What schools serve 309 Frederick Ave, Rockville, MD?

309 Frederick Ave, Rockville, MD is assigned to Beall Elementary School (elementary), rated B; Richard Montgomery High School (high), rated A-; Julius West Middle School (middle), rated A. All sit in Montgomery County Public Schools. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 309 Frederick Ave, Rockville, MD compare to other homes in Rockville 20850?

Among the 14,094 homes in Rockville 20850, it is worth more than 43% of them ($700,269 against a typical $770,079), its price per square foot is higher than 10% of them ($248 against a typical $340), it is bigger than 74% of them (2,822 ft² against a typical 2,037 ft²), its lot is bigger than 88% of them (0.32 ac against a typical 4,225 ft²) and it is newer than 92% of them (2008 against a typical 1991). Measured against all of Montgomery County, it is worth more than 57% of homes there. These shares are recounted nightly from the full county assessor record for each area, not from active listings.

What are the property taxes on 309 Frederick Ave, Rockville, MD?

The 2025 property tax bill for 309 Frederick Ave, Rockville, MD was $8,703. The county assessed it at $697,800.

More homes on Frederick Ave

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Assigned schools

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